Plaster mixing machine



1951 M. BEAN ET AL PLASTE'R MIXING MACHINE 19 Sheets-Sheet 2 Filed June 29, 1946 INVENTORS Nov. 6, 1951 M. BEAN ET AL PLASTER MIXING MACHINE l9 Sheets-Sheet 5 lNV ENTORS Filed June 29, 1946 Nov. 6, 1951 M. BEAN ET AL 2,574,238

PLASTER MIXINGMACHINE Filed June 29, 1946 19 Sheets-Sheet 4 f/MJJW 6W M. BEAN ET AL Nzw. 6, 1951 PLASTER MIXING MACHINE 19 Sheets-Sheet 5 Filed June 29, 1946 INVENTORS M. BEAN ET AL PLASTER MIXING MACHINE Nov. 6, 1951 Filed June 29, 1946 19 Sheets-Sheet 6 M. BEAN ET AL PLASTER MIXING MACHINE Nov. 6, 1951 19 Sheets-Sheet 7 Filed June 29, 1946 INVENTORS Nov. 6, 1951 M. BEAN ET AL 2,574,238

PLASTER MIXING MACHINE Filed June 29, 1946 l9 Sheets-Sheet 8 4 mvzunzgs Nov. 6, 1951 M. BEAN ET AL PLASTER MIXING MACHINE 19 Sheets-Sheet 9 Filed June 29, 1946 INVENTORS W HI Nov. 6, 1951 M. BEAN ET AL 2,574,238

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PL ASTER MIXING MACHINE Filed June 29, 1945 19 Sheds-Sheet 1s INVENTORS Nov. 6, 1951 M. BEAN ET AL PLASTER MIXING MACHINE l9 Sheets-Sheet 14 Filed June 29, 1946 INVENTORS M. BEAN ET AL PLASTER MIXING MACHINE Nov. 6, 1951 19 Sheets-Sheet 15 Filed June 29, 1946 INVENTOR$ Nav. 6, 1951 M. BEAN ET AL 2,574,238

PLASTE'R MIXING MACHINE INVENTORS Nov. 6, 195! M. BEAN ET AL PLASTER MIXING MACHINE l9 Sheets-Sheet 17 Filed June 29, 1946 'fli .SPA'E'D CMTROL 17 NV ENTgR 5 M414, W 7At J m ATTORNEYS Nov. 6, 1951 M. BEAN ET AL 2,574,238

PLASTER MIXING MACHINE Filed June 29, 1946 19 Sheets-Sheet 18 a, 3 INVENTORS 6,3 1. ATTCIDRNEY;

Nov. 6, 1951 M. BEAN ET AL PLASTER MIXING MACHINE Filed June 29, 1946 l9 Sheets-Sheet l9 nvs (ILA now INVENTORS 777% Patented Nov. 6, 1951 PLAs'rER MIXING MACHINE Morris Bean and William S. Touchman, Yellow Springs, Ohio,

and William G. Bruckman,

Bergenfield, N. J4; assignors to General Motors Corporation, Detroit, Mich., a corporation of Delaware Application June 29, 1946, Serial No. 680,454

7 Claims.

The invention relates to a plaster mixing machine especially adapted for use in the formation of plaster of Paris bonded molds and cores.

In forming molds or cores in which plaster of Paris is used as the bonding agent it is important that the water and dry plaster be supplied in just the right proportions at all times as otherwise the plaster will not have the required strength or will be otherwise faulty for the intended purpose. Because of the speed with which the slurry sets it is also important that once the slurry is formed in the plaster mixing machine that it be caused to flow therefrom before it has a chance to set in the machine. The above conditions are some of the factors that have to be taken into account in a machine of this sort. The primary object of the invention is to provide an improved machine for mixing plaster and water and feeding the slurry thus formed to molds or core boxes, especially a machine of this type that is continuous in operation. 7

Reference is herewith made to the accompanying drawings showing a machine in accordance with one embodiment of the invention.

In the drawings:

Figs. 1A and 1B together are a side elevational view with parts broken away of the main portion of a plaster mixing machine in accordance with the invention.

Figure 2 is a front elevational view with parts broken away and parts in section of the machine illustrated in Figures 1A and 1B.

Figure 3 is a View looking toward the left in Figure 1B showing diagrammatically driving means for certain parts. 1

Figure 3A is a sectional view on line 3A-3A in Figure 1B.

Figure 4 is a sectional view of a plaster fiufiin unit taken substantially on line X-X-XX in Figure 2.

Figure 5 is a view of the fiuffing unit illustrated in Figure 4, the right-hand side of Figure 5 being taken on line A-A in Figure 4, and the lefthand side being taken on line B-B in Figure 4.

Figure 6 is an elevational view with parts broken'away and in section of a metering unit for the dry plaster fed by gravity from the fluffing unit.

Figure 7 is a sectional view taken substantially on line 'l-.--! in Fig. 6.

Figure 8 is an elevational and partial sectional view of a unit located immediately below the metering unit of Figures 6 and 7 and showing a wet cone and mixing unit for intimately mixing water with the dry plaster mix.

Figure 9 is a View substantially on line 99 in Figure 8 showing a slide gate and operating means therefor for controlling flow of dry plaster to the wet cone unit and also illustrating means through which water enters the wet cone unit.

Figure 10 is a fragmentary elevational view illustrating means for operating the slide gate illustrated in Figure 9.

Figure 11 is a view with parts broken away and in section of a gear pump, mounting means and drive therefor for feeding a metered amount of water to the wet cone.

Figure 12 is a view illustrating driving means for the gear pump for metering water and for the metering wheel for feeding dry plaster.

Figure 13 is a sectional view substantially on line |3-|3 in Fig. 14 showing a chamber located immediately below the mixing unit adapted to receive the slurry from'the mixing unit and a slurry pump for feeding the slurry from the bottom of the chamber. Figure 14 is a top plan view showing the slurry receiving chamber and means for removably securing together the slurry receiving chamber and slurry pump and showing mounting means for these units.

Figure 15 is a sectional view of a detail on line I5-l 5 of Figure 13.

Figure 16 is atop plan view of the slurry pump taken on line l6--l 6 in Figure 13.

Figure 17 is a rotated elevational view of the device of Figure 16. v

Figure 18 is a sectional view substantially on line |8l8 inFigure 16.

Figure 19 is an elevational 'view with partsbroken away illustrating means for supporting the slurry chamber and diagrammatically illustrating control means operated by movement thereof for controlling speed of the motor driving the water and plaster metering devices.

Figure 20 is an end view of the device of Fi ure 19 taken at a right anglewith respect to Figure 19.

Figure 21 is a diagrammatic view illustrating the motor means driving the water and plaster metering devices and illustrating means for controlling the speed of rotation of the motor as the weight of slurry in the slurry chamber increases or decreases.

Figure 22 is a diagrammatic showing of a rotatable and extensible boom connected at one end to the frame of the machine and showing a hose supported by the boom and means for controlling fiow of plaster through the hose. 

